"He only has 9% kidney function, and the only thing that can cure him is a transplant," she told the Daily News. "He needs dialysis three times a week. I'm guessing that he wanted to do one last thing for his country before he died."

Faulkner, 50, was born in California but moved decades ago to Colorado, where he worked construction.

His sister said he was no bounty hunter and not after the $50 million reward the U.S. has offered for Bin Laden's capture or killing.

"My brother is extremely religious since his troubled youth," his 47-year-old sister said. "He's not crazy."

"He is highly intelligent and loves his country and he has not forgotten what Osama has done to this country," Faulkner's brother, Scott, 44, told CNN.

Intelligence officials have long suspected that Bin Laden, the monster behind the 9/11 attacks, has kidney troubles and relies on dialysis.

Armed with a sword and pistol and some Christians texts, Faulkner was stopped by suspicious Pakistani authorities before he could complete his quest.

He reportedly told police he had been hunting Bin Laden since the September 11, 2001, terror attacks and intended to lop off his head with the 40-inch sword.

When asked if he thought he actually had a chance of finding Bin Laden, Faulkner told authorities, "God is with me, and I am confident I will be successful in killing him," Khan said.

Faulker entered Pakistan on a tourist visa, and police had been assigned to watch him, which is not uncommon for foreigners, according to authorities. When he disappeared without informing anyone, they began searching for him.

Deanna Faulkner said her brother had been to Pakistan at least three times but doesn't have any military experience. "He does come from a family of hunters," she said.